Thermo-electric alarm.



PATENTED DEO. 13, 1904..

A. HASLINGER.

THERMO ELECTRIC ALARM.

APPLICATION FILED APE. 30,1904.

.N0 MODEL.

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UNITED STATES Patented December 13, 1904.

PATENT @EEIGE THERMO-ELECTRIC ALARM.

SPECIFICATION forming part of Letters Patent No. 777,506, dated December13, 1904.

Application led April 30, 1904.

Be it known that I, ANTON HAsLINeER, a subject of the Emperor ofAustria-Hungary, residing at Allegheny, in the county of Allegheny andState of Pennsylvania, have invented certain new and useful improvementsin Thermo-Electric Alarms, of which the following is a specification,reference being had therein to the accompanying' drawings.

This invention has relation to alarms, and more `particularly to thatclass. known as thermo-electrlc alarms, wherein a thermostat, bell, andan electric current are used to sound an alarm at a predetermined time.

The object of my invention is to construct a thermo-electric alarm whichmay be employed in connection with gas-stoves, whereby should thegas-supply be shut off unbeknown to the consumer an alarm will be given.

Briefly described, my invention consists in employing a thermostat,which is connected to the side of a gas-stove, and a bell and electricalsource or' energj,T are located in any suitable place wherein il thealarm is sounded the same will be heard, and the gas-stop cock used inconnection with the gas-stove may be closed whereby should thegas-supply again be turned on it will be impossible for the same toescape into the compartment in which the stove is used.

With the above and other objects in view reference will be had to theaccompanying1 drawings, forming a part of this application, wherein likenumerals of reference indicate like parts throughout the several views,in which- Figure 1 is a diagrammatical view showing the thermostatattached to the'side of the stove and in circuit with the electric belland the electric source of energy. Fig. 2 is a front elevation of thethermostat, and Fig. 3 is a rear elevation thereof.

To put my invention into practice, 1 have constructed a thermostat whichmay be readily attached to the side of any form of gas-stove, wherebythe heat from the same will affect the thermostat and operate it toaccomplish the desired results, and in carrying out my invention I haveillustrated in Fig. 1 of the drawings a perspective view of the ordinarySerial No. 205,693. (No model.)

type of gas-stove commonly used, the reference-numeral 1 indicating thestove, which has a gas-supply pipe 2, carrying the ordinary stop-cock 3,this gas-supply pipe 2 being connected to the ordinary combustionchamber or burner 1.

The thermostat, as designated by the reference-numeral 5, is constructedwith an annular casing 6, supported upon an annular plate 7, havingoutwardly-eXtending lugs 8 8, which are provided with apertures 9 9,whereby said thermostat may be secured to the side ot' a stove, and inFig. 1 o'lI the drawings l have shown the same connected to the stove 1by rivets 1() 10. The casing 6 of the thermostat is provided withbinding-posts 11 12, to which the wires 14 15 are connected by screws 1616, and to the binding-post 12 another wire, 17, is attached by a screw18, this wire having its other end connected to a post 19, carried bythe plate 7 of the thermostat. The casing 6 of the thermostat hasattached thereto a sensitive spring 20, said spring heilig' attached. tothe casing by rivets 21, and the other end or' said spring is twisted atright angles to itself, as designated at 22, and pivoted to a bar 7', asindicated at 23, the outer end oi' the bar being bent at right anglesand pivotally connected, as indicated at 24, to an arm 25, this armbeing' formed integral with a segmental rack 26, which is pivoted at 27between the arm 28 and the plate 7. The arm 28 is T-shaped in t'orm andis supported upon its one end by a pin 29, while the T-shaped endthereof is supported upon pins 30, these pins being' carried by theplate 7. rlhe segmental rack 26 meshes with a pinion 31, which isconnected to a shaft 32, said shaft protruding through the plate 7 andhas secured onrits outer end the screw 33 and indicating-hand 84. InFig. 2 of the drawings it will be seen that the other side o1 the plate7 to that illustrated in Fig. 3 carries a casing 35, which is providedwith a glass cover 36, and on this side of the plate 7 is arranged thegraduationmarks 37, the object of which will be hereinafter more fullydescribed.

As before stated, a wire 15 is connected to the binding-post 12, andtheother end oi this wire, as shown in Fig. 1 of the drawings, is

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connected to a post 38 of an electric bell 39, this bell being of theordinary construction and carries vanother post, 40, to which isconnected the end of a wire 41, which in turn is connected to thepositive pole 42 of a battery 43, the negative pole 44 of said batteryhaving a wire 45 connected to it, and the other end of this wire 45 isconnected to a contactpin 46, carried by the switch-block 47. rIhisswitch-block is of the ordinary construction and carries a pivoted lever48, to the pivoted end 49 of which is connected the end of the wire 14,the other end of which is connected to the binding-post 11 of thethermostat.

The operation of my improved alarm is as follows: By referring to Fig. 1of the drawings it will be observed that I have mounted the thermostat 5upon the side wall of a gasstove, although the same may be mounted inany other desired place, whereby the heat from the stove will effect andoperate the thermostat, and I have employed in the thermostat theordinary and well-known sensitive spring, as indicated at 20. When theheat from the stove is shut off, the spring remains in the contractedpostion, (shown in Fig. 3 of the drawings,) normally holding the pivotedend 24 of said spring in contact with a pin 50, formed integral with theend of the binding-post 11.

In case the switch-lever 48 should be in the closed position and inengagement with the contact-pin 46, a circuit will be completed throughwire 14 to switch-lever 48, through contact-pin 46 to wire 45, tothenegative pole 44 of the battery which forms the source of electricalenergy, from the positive pole 42 through wire 41, which is connected tothe post 40 of the bell 39, from whencethe circuit proceeds from thepost 38 through the wire 15 to the binding-post 12, through wire 17 tothe post 19, carried by the plate 7, from whence the circuit is conveyedthrough pivot 27 to the arm 25.

The circuit just described is completed and rings the electric Ibell 39when the gas-supply which comes through the pipe 2 of the stove has beenshut off unbeknown to the consumer; but when the gas is burning in thestove l the heat from the stove expands the sensitive spring 22 andthrows the same in the position shown in dotted lines of Fig. 3, whereinthe arm 25 is held out of engagement with the pin 5() of thebinding-post 11 and the circuit is broken. The switch 47 is located inany desired position, whereby the circuit may be broken when it is notdesired to use the apparatus, and in case the same is to be used thelever 48 of the switch is thrown into engagement with the contact-pins46.

Upon the sensitive spring 22 being expanded or contracted by the stovethe arm 25 will be moved in one or the other direction, whereby thesegmental rack 26 will be operated, and as the same meshes with thepinion 31, carried by the shaft 32, the pinion will be rotated, re-

volving the hand 34, carried upon the other end of the shaft 32 in oneor the other direction, and I employ the dial 36, which is graduated,whereby a danger-point caused by the,

gas in the stove becoming very low can be noticed by examining the dialof the thermostat. The switch 47 is also used, whereby should the gas ofthe stove 1 be shut olf unbelinown to the consumer and the alarm isgiven the consumer can close the supply of gas by the stop-cock 3, andthus by drawing the switchlever 48 out of engagement with the contactpin46 the further sounding of the alarm can be stopped until it is desiredto use the same again, at which time the switch-lever 48 is thrown intoengagement with the contact-pin 46 and another alarm is ready to begiven in case the supply of gas should be shut off.

From the above description it will be seen that my improved alarm willentirely eliminate all danger in connection with gas-stoves which hasbeen experienced where the supply of gas has for some reason or otherbeen shut off unbeknown to the consumer when the stove was consuming thesame, and while I have herein shown my improved alarm system asconnected to a gas-stove it is obvious that the same may be readilyemployed in connection with furnaces and the like, whereby an alarm willbe given if the fires in the same become very low and need attention.

What I claim, and desire to secure by Letters Patent, is-

1. In an apparatus of the character described, the combination of agas-stove, a thermostat attached to the exterior of the stove andprovided withcontact-points, a dial and an indicating-hand, an electriccircuit including a battery, an electric bell and the contactpoints ofthe thermostat, with a gas-supply pipe leading to said stove, agas-burner located within the stove and a cock on said pipe, the saidcock being located apart and electrically insulated from said electriccircuit and being operable independently to regulate the flow of gaswithout affecting the continuity of said circuit.

2. In a device of the character described, the combination with agas-stove, a burner located within the stove, a gas-supply pipe leadingto the stove and a cock on said supply-pipe, of a thermostat comprisinga casing, a sensitive spring located within the casing, a bar pivotallyattached to one end of said spring, a pivotally-supported segmental rackhaving an arm connected to said bar, a pinion meshing with saidsegmental rack, a shaft on which said pinion is mounted, a hand carriedby said shaft, a dial on the outside of the casing, an electric contactmounted in said casing and adapted to touch the arm of the segmentalrack at one position of the rack and an electric circuit including saidcontact, and said segmental rack and also including a battery and asignal device.

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3. In a device of the character described, the combination with agas-,stove having a suitable supply of gas, a thermostat attached.

to said stove, a dial carried by said thermostat, a sensitive springcarried by said thermostat, a rotatable shaft mounted in saidthermostat, a hand carried upon one end of said shaft,l means wherebywhen said spring' is contracted, or expanded, said hand will be rotatedupon the dial, an electric bell, said bell and thermostat being incircuit vwith a suit- H. C. EYERT, WM. (l. HEITZ.

